Calibrate Your Testimony Language
tactic
Core idea
Every sentence in a report or on the stand should describe either an action you took or an observation you made, never what something means. Meaning is opinion, and opinion belongs only to a designated expert. Anchor your language in plain action: what you did, what you observed, and where the information came from.
Components
Phrasings to avoid as a fact witness:
- Forensic terms of art: “consistent with,” “indicative of,” “characteristic of.”
- Probabilistic language without disclosed methodology: “very likely,” “almost certainly.”
- Conclusory shortcuts: “this is a mixer,” “these addresses belong to the same person.”
Corroboration phrasing for Layer 2 findings: say “I built a spreadsheet of 47 co-spending transactions linking the addresses; the tool’s cluster output corroborates this finding” (your evidence, the tool corroborates), not “the tool clusters these addresses” (an uncorroborated tool conclusion).
When to use
Drafting any report headed for court, and preparing for the stand.
Example
Replace the present-tense, unqualified “the address holds 12 BTC” with the temporally anchored “the address held 12 BTC as of block 812,453, recorded at 14:32 UTC on 24 May 2026.” The qualifier survives the defence question “does it still hold that today?”
Related
The Three Layers of Blockchain Evidence, Fact Witness vs Expert Witness, Separate On-Chain Fact from Analytical Inference, Time-Decay of Crypto Evidence